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How to calculate with cells that contain two values separated by linebreak?

I've got a Google spreadsheet that looks like this:

Start time   |    End Time   |  Time difference
-------------+---------------+-----------------
    11:30:00 |    12:45:00   |     1,25     
-------------+---------------+-----------------
    09:20:00 |    10:30:00   |  
    11:35:00 |    12:00:00   |    #VALUE!
-------------+---------------+-----------------

In the 3rd column I have a formula that calculates the difference in decimal number. 1st row works, can I make it work with the 2nd row without splitting the cell?

This is the error I get when I hover over #VALUE: Error Function MINUS parameter 1 expects number values. But '10:30:00 12:00:00' is a text and cannot be coerced to a number.

Formula is =(D26-C26)*24, where C26 and D26 are formated as time, E column is formated as number.